Merge branch 'for-4.16/block' of git://git.kernel.dk/linux-block

Pull block updates from Jens Axboe:
 "This is the main pull request for block IO related changes for the
  4.16 kernel. Nothing major in this pull request, but a good amount of
  improvements and fixes all over the map. This contains:

   - BFQ improvements, fixes, and cleanups from Angelo, Chiara, and
     Paolo.

   - Support for SMR zones for deadline and mq-deadline from Damien and
     Christoph.

   - Set of fixes for bcache by way of Michael Lyle, including fixes
     from himself, Kent, Rui, Tang, and Coly.

   - Series from Matias for lightnvm with fixes from Hans Holmberg,
     Javier, and Matias. Mostly centered around pblk, and the removing
     rrpc 1.2 in preparation for supporting 2.0.

   - A couple of NVMe pull requests from Christoph. Nothing major in
     here, just fixes and cleanups, and support for command tracing from
     Johannes.

   - Support for blk-throttle for tracking reads and writes separately.
     From Joseph Qi. A few cleanups/fixes also for blk-throttle from
     Weiping.

   - Series from Mike Snitzer that enables dm to register its queue more
     logically, something that's alwways been problematic on dm since
     it's a stacked device.

   - Series from Ming cleaning up some of the bio accessor use, in
     preparation for supporting multipage bvecs.

   - Various fixes from Ming closing up holes around queue mapping and
     quiescing.

   - BSD partition fix from Richard Narron, fixing a problem where we
     can't mount newer (10/11) FreeBSD partitions.

   - Series from Tejun reworking blk-mq timeout handling. The previous
     scheme relied on atomic bits, but it had races where we would think
     a request had timed out if it to reused at the wrong time.

   - null_blk now supports faking timeouts, to enable us to better
     exercise and test that functionality separately. From me.

   - Kill the separate atomic poll bit in the request struct. After
     this, we don't use the atomic bits on blk-mq anymore at all. From
     me.

   - sgl_alloc/free helpers from Bart.

   - Heavily contended tag case scalability improvement from me.

   - Various little fixes and cleanups from Arnd, Bart, Corentin,
     Douglas, Eryu, Goldwyn, and myself"

* 'for-4.16/block' of git://git.kernel.dk/linux-block: (186 commits)
  block: remove smart1,2.h
  nvme: add tracepoint for nvme_complete_rq
  nvme: add tracepoint for nvme_setup_cmd
  nvme-pci: introduce RECONNECTING state to mark initializing procedure
  nvme-rdma: remove redundant boolean for inline_data
  nvme: don't free uuid pointer before printing it
  nvme-pci: Suspend queues after deleting them
  bsg: use pr_debug instead of hand crafted macros
  blk-mq-debugfs: don't allow write on attributes with seq_operations set
  nvme-pci: Fix queue double allocations
  block: Set BIO_TRACE_COMPLETION on new bio during split
  blk-throttle: use queue_is_rq_based
  block: Remove kblockd_schedule_delayed_work{,_on}()
  blk-mq: Avoid that blk_mq_delay_run_hw_queue() introduces unintended delays
  blk-mq: Rename blk_mq_request_direct_issue() into blk_mq_request_issue_directly()
  lib/scatterlist: Fix chaining support in sgl_alloc_order()
  blk-throttle: track read and write request individually
  block: add bdev_read_only() checks to common helpers
  block: fail op_is_write() requests to read-only partitions
  blk-throttle: export io_serviced_recursive, io_service_bytes_recursive
  ...

1 files changed, 196 insertions, 48 deletions

diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index 6a018a0bd6ce..34712def81b1 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -204,6 +204,10 @@ struct fcloop_lport {
 	struct completion unreg_done;
 };
 
+struct fcloop_lport_priv {
+	struct fcloop_lport *lport;
+};
+
 struct fcloop_rport {
 	struct nvme_fc_remote_port *remoteport;
 	struct nvmet_fc_target_port *targetport;
@@ -238,21 +242,32 @@ struct fcloop_lsreq {
 	int				status;
 };
 
+enum {
+	INI_IO_START		= 0,
+	INI_IO_ACTIVE		= 1,
+	INI_IO_ABORTED		= 2,
+	INI_IO_COMPLETED	= 3,
+};
+
 struct fcloop_fcpreq {
 	struct fcloop_tport		*tport;
 	struct nvmefc_fcp_req		*fcpreq;
 	spinlock_t			reqlock;
 	u16				status;
+	u32				inistate;
 	bool				active;
 	bool				aborted;
-	struct work_struct		work;
+	struct kref			ref;
+	struct work_struct		fcp_rcv_work;
+	struct work_struct		abort_rcv_work;
+	struct work_struct		tio_done_work;
 	struct nvmefc_tgt_fcp_req	tgt_fcp_req;
 };
 
 struct fcloop_ini_fcpreq {
 	struct nvmefc_fcp_req		*fcpreq;
 	struct fcloop_fcpreq		*tfcp_req;
-	struct work_struct		iniwork;
+	spinlock_t			inilock;
 };
 
 static inline struct fcloop_lsreq *
@@ -343,17 +358,122 @@ fcloop_xmt_ls_rsp(struct nvmet_fc_target_port *tport,
 	return 0;
 }
 
-/*
- * FCP IO operation done by initiator abort.
- * call back up initiator "done" flows.
- */
 static void
-fcloop_tgt_fcprqst_ini_done_work(struct work_struct *work)
+fcloop_tfcp_req_free(struct kref *ref)
 {
-	struct fcloop_ini_fcpreq *inireq =
-		container_of(work, struct fcloop_ini_fcpreq, iniwork);
+	struct fcloop_fcpreq *tfcp_req =
+		container_of(ref, struct fcloop_fcpreq, ref);
+
+	kfree(tfcp_req);
+}
+
+static void
+fcloop_tfcp_req_put(struct fcloop_fcpreq *tfcp_req)
+{
+	kref_put(&tfcp_req->ref, fcloop_tfcp_req_free);
+}
+
+static int
+fcloop_tfcp_req_get(struct fcloop_fcpreq *tfcp_req)
+{
+	return kref_get_unless_zero(&tfcp_req->ref);
+}
+
+static void
+fcloop_call_host_done(struct nvmefc_fcp_req *fcpreq,
+			struct fcloop_fcpreq *tfcp_req, int status)
+{
+	struct fcloop_ini_fcpreq *inireq = NULL;
+
+	if (fcpreq) {
+		inireq = fcpreq->private;
+		spin_lock(&inireq->inilock);
+		inireq->tfcp_req = NULL;
+		spin_unlock(&inireq->inilock);
+
+		fcpreq->status = status;
+		fcpreq->done(fcpreq);
+	}
+
+	/* release original io reference on tgt struct */
+	fcloop_tfcp_req_put(tfcp_req);
+}
+
+static void
+fcloop_fcp_recv_work(struct work_struct *work)
+{
+	struct fcloop_fcpreq *tfcp_req =
+		container_of(work, struct fcloop_fcpreq, fcp_rcv_work);
+	struct nvmefc_fcp_req *fcpreq = tfcp_req->fcpreq;
+	int ret = 0;
+	bool aborted = false;
+
+	spin_lock(&tfcp_req->reqlock);
+	switch (tfcp_req->inistate) {
+	case INI_IO_START:
+		tfcp_req->inistate = INI_IO_ACTIVE;
+		break;
+	case INI_IO_ABORTED:
+		aborted = true;
+		break;
+	default:
+		spin_unlock(&tfcp_req->reqlock);
+		WARN_ON(1);
+		return;
+	}
+	spin_unlock(&tfcp_req->reqlock);
+
+	if (unlikely(aborted))
+		ret = -ECANCELED;
+	else
+		ret = nvmet_fc_rcv_fcp_req(tfcp_req->tport->targetport,
+				&tfcp_req->tgt_fcp_req,
+				fcpreq->cmdaddr, fcpreq->cmdlen);
+	if (ret)
+		fcloop_call_host_done(fcpreq, tfcp_req, ret);
+
+	return;
+}
+
+static void
+fcloop_fcp_abort_recv_work(struct work_struct *work)
+{
+	struct fcloop_fcpreq *tfcp_req =
+		container_of(work, struct fcloop_fcpreq, abort_rcv_work);
+	struct nvmefc_fcp_req *fcpreq;
+	bool completed = false;
+
+	spin_lock(&tfcp_req->reqlock);
+	fcpreq = tfcp_req->fcpreq;
+	switch (tfcp_req->inistate) {
+	case INI_IO_ABORTED:
+		break;
+	case INI_IO_COMPLETED:
+		completed = true;
+		break;
+	default:
+		spin_unlock(&tfcp_req->reqlock);
+		WARN_ON(1);
+		return;
+	}
+	spin_unlock(&tfcp_req->reqlock);
+
+	if (unlikely(completed)) {
+		/* remove reference taken in original abort downcall */
+		fcloop_tfcp_req_put(tfcp_req);
+		return;
+	}
 
-	inireq->fcpreq->done(inireq->fcpreq);
+	if (tfcp_req->tport->targetport)
+		nvmet_fc_rcv_fcp_abort(tfcp_req->tport->targetport,
+					&tfcp_req->tgt_fcp_req);
+
+	spin_lock(&tfcp_req->reqlock);
+	tfcp_req->fcpreq = NULL;
+	spin_unlock(&tfcp_req->reqlock);
+
+	fcloop_call_host_done(fcpreq, tfcp_req, -ECANCELED);
+	/* call_host_done releases reference for abort downcall */
 }
 
 /*
@@ -364,20 +484,15 @@ static void
 fcloop_tgt_fcprqst_done_work(struct work_struct *work)
 {
 	struct fcloop_fcpreq *tfcp_req =
-		container_of(work, struct fcloop_fcpreq, work);
-	struct fcloop_tport *tport = tfcp_req->tport;
+		container_of(work, struct fcloop_fcpreq, tio_done_work);
 	struct nvmefc_fcp_req *fcpreq;
 
 	spin_lock(&tfcp_req->reqlock);
 	fcpreq = tfcp_req->fcpreq;
+	tfcp_req->inistate = INI_IO_COMPLETED;
 	spin_unlock(&tfcp_req->reqlock);
 
-	if (tport->remoteport && fcpreq) {
-		fcpreq->status = tfcp_req->status;
-		fcpreq->done(fcpreq);
-	}
-
-	kfree(tfcp_req);
+	fcloop_call_host_done(fcpreq, tfcp_req, tfcp_req->status);
 }
 
 
@@ -390,7 +505,6 @@ fcloop_fcp_req(struct nvme_fc_local_port *localport,
 	struct fcloop_rport *rport = remoteport->private;
 	struct fcloop_ini_fcpreq *inireq = fcpreq->private;
 	struct fcloop_fcpreq *tfcp_req;
-	int ret = 0;
 
 	if (!rport->targetport)
 		return -ECONNREFUSED;
@@ -401,16 +515,20 @@ fcloop_fcp_req(struct nvme_fc_local_port *localport,
 
 	inireq->fcpreq = fcpreq;
 	inireq->tfcp_req = tfcp_req;
-	INIT_WORK(&inireq->iniwork, fcloop_tgt_fcprqst_ini_done_work);
+	spin_lock_init(&inireq->inilock);
+
 	tfcp_req->fcpreq = fcpreq;
 	tfcp_req->tport = rport->targetport->private;
+	tfcp_req->inistate = INI_IO_START;
 	spin_lock_init(&tfcp_req->reqlock);
-	INIT_WORK(&tfcp_req->work, fcloop_tgt_fcprqst_done_work);
+	INIT_WORK(&tfcp_req->fcp_rcv_work, fcloop_fcp_recv_work);
+	INIT_WORK(&tfcp_req->abort_rcv_work, fcloop_fcp_abort_recv_work);
+	INIT_WORK(&tfcp_req->tio_done_work, fcloop_tgt_fcprqst_done_work);
+	kref_init(&tfcp_req->ref);
 
-	ret = nvmet_fc_rcv_fcp_req(rport->targetport, &tfcp_req->tgt_fcp_req,
-				 fcpreq->cmdaddr, fcpreq->cmdlen);
+	schedule_work(&tfcp_req->fcp_rcv_work);
 
-	return ret;
+	return 0;
 }
 
 static void
@@ -589,7 +707,7 @@ fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport,
 {
 	struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
 
-	schedule_work(&tfcp_req->work);
+	schedule_work(&tfcp_req->tio_done_work);
 }
 
 static void
@@ -605,27 +723,47 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
 			void *hw_queue_handle,
 			struct nvmefc_fcp_req *fcpreq)
 {
-	struct fcloop_rport *rport = remoteport->private;
 	struct fcloop_ini_fcpreq *inireq = fcpreq->private;
-	struct fcloop_fcpreq *tfcp_req = inireq->tfcp_req;
+	struct fcloop_fcpreq *tfcp_req;
+	bool abortio = true;
+
+	spin_lock(&inireq->inilock);
+	tfcp_req = inireq->tfcp_req;
+	if (tfcp_req)
+		fcloop_tfcp_req_get(tfcp_req);
+	spin_unlock(&inireq->inilock);
 
 	if (!tfcp_req)
 		/* abort has already been called */
 		return;
 
-	if (rport->targetport)
-		nvmet_fc_rcv_fcp_abort(rport->targetport,
-					&tfcp_req->tgt_fcp_req);
-
 	/* break initiator/target relationship for io */
 	spin_lock(&tfcp_req->reqlock);
-	inireq->tfcp_req = NULL;
-	tfcp_req->fcpreq = NULL;
+	switch (tfcp_req->inistate) {
+	case INI_IO_START:
+	case INI_IO_ACTIVE:
+		tfcp_req->inistate = INI_IO_ABORTED;
+		break;
+	case INI_IO_COMPLETED:
+		abortio = false;
+		break;
+	default:
+		spin_unlock(&tfcp_req->reqlock);
+		WARN_ON(1);
+		return;
+	}
 	spin_unlock(&tfcp_req->reqlock);
 
-	/* post the aborted io completion */
-	fcpreq->status = -ECANCELED;
-	schedule_work(&inireq->iniwork);
+	if (abortio)
+		/* leave the reference while the work item is scheduled */
+		WARN_ON(!schedule_work(&tfcp_req->abort_rcv_work));
+	else  {
+		/*
+		 * as the io has already had the done callback made,
+		 * nothing more to do. So release the reference taken above
+		 */
+		fcloop_tfcp_req_put(tfcp_req);
+	}
 }
 
 static void
@@ -657,7 +795,8 @@ fcloop_nport_get(struct fcloop_nport *nport)
 static void
 fcloop_localport_delete(struct nvme_fc_local_port *localport)
 {
-	struct fcloop_lport *lport = localport->private;
+	struct fcloop_lport_priv *lport_priv = localport->private;
+	struct fcloop_lport *lport = lport_priv->lport;
 
 	/* release any threads waiting for the unreg to complete */
 	complete(&lport->unreg_done);
@@ -697,7 +836,7 @@ static struct nvme_fc_port_template fctemplate = {
 	.max_dif_sgl_segments	= FCLOOP_SGL_SEGS,
 	.dma_boundary		= FCLOOP_DMABOUND_4G,
 	/* sizes of additional private data for data structures */
-	.local_priv_sz		= sizeof(struct fcloop_lport),
+	.local_priv_sz		= sizeof(struct fcloop_lport_priv),
 	.remote_priv_sz		= sizeof(struct fcloop_rport),
 	.lsrqst_priv_sz		= sizeof(struct fcloop_lsreq),
 	.fcprqst_priv_sz	= sizeof(struct fcloop_ini_fcpreq),
@@ -714,8 +853,7 @@ static struct nvmet_fc_target_template tgttemplate = {
 	.max_dif_sgl_segments	= FCLOOP_SGL_SEGS,
 	.dma_boundary		= FCLOOP_DMABOUND_4G,
 	/* optional features */
-	.target_features	= NVMET_FCTGTFEAT_CMD_IN_ISR |
-				  NVMET_FCTGTFEAT_OPDONE_IN_ISR,
+	.target_features	= 0,
 	/* sizes of additional private data for data structures */
 	.target_priv_sz		= sizeof(struct fcloop_tport),
 };
@@ -728,11 +866,17 @@ fcloop_create_local_port(struct device *dev, struct device_attribute *attr,
 	struct fcloop_ctrl_options *opts;
 	struct nvme_fc_local_port *localport;
 	struct fcloop_lport *lport;
-	int ret;
+	struct fcloop_lport_priv *lport_priv;
+	unsigned long flags;
+	int ret = -ENOMEM;
+
+	lport = kzalloc(sizeof(*lport), GFP_KERNEL);
+	if (!lport)
+		return -ENOMEM;
 
 	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
 	if (!opts)
-		return -ENOMEM;
+		goto out_free_lport;
 
 	ret = fcloop_parse_options(opts, buf);
 	if (ret)
@@ -752,23 +896,25 @@ fcloop_create_local_port(struct device *dev, struct device_attribute *attr,
 
 	ret = nvme_fc_register_localport(&pinfo, &fctemplate, NULL, &localport);
 	if (!ret) {
-		unsigned long flags;
-
 		/* success */
-		lport = localport->private;
+		lport_priv = localport->private;
+		lport_priv->lport = lport;
+
 		lport->localport = localport;
 		INIT_LIST_HEAD(&lport->lport_list);
 
 		spin_lock_irqsave(&fcloop_lock, flags);
 		list_add_tail(&lport->lport_list, &fcloop_lports);
 		spin_unlock_irqrestore(&fcloop_lock, flags);
-
-		/* mark all of the input buffer consumed */
-		ret = count;
 	}
 
 out_free_opts:
 	kfree(opts);
+out_free_lport:
+	/* free only if we're going to fail */
+	if (ret)
+		kfree(lport);
+
 	return ret ? ret : count;
 }
 
@@ -790,6 +936,8 @@ __wait_localport_unreg(struct fcloop_lport *lport)
 
 	wait_for_completion(&lport->unreg_done);
 
+	kfree(lport);
+
 	return ret;
 }